1 package antlr;
2
3 * <b>SOFTWARE RIGHTS</b>
5 * <p>
6 * ANTLR 2.5.0 MageLang Institute, 1998
7 * <p>
8 * We reserve no legal rights to the ANTLR--it is fully in the
9 * public domain. An individual or company may do whatever
10 * they wish with source code distributed with ANTLR or the
11 * code generated by ANTLR, including the incorporation of
12 * ANTLR, or its output, into commerical software.
13 * <p>
14 * We encourage users to develop software with ANTLR. However,
15 * we do ask that credit is given to us for developing
16 * ANTLR. By "credit", we mean that if you use ANTLR or
17 * incorporate any source code into one of your programs
18 * (commercial product, research project, or otherwise) that
19 * you acknowledge this fact somewhere in the documentation,
20 * research report, etc... If you like ANTLR and have
21 * developed a nice tool with the output, please mention that
22 * you developed it using ANTLR. In addition, we ask that the
23 * headers remain intact in our source code. As long as these
24 * guidelines are kept, we expect to continue enhancing this
25 * system and expect to make other tools available as they are
26 * completed.
27 * <p>
28 * The ANTLR gang:
29 * @version ANTLR 2.5.0 MageLang Institute, 1998
30 * @author Terence Parr, <a href=http://www.MageLang.com>MageLang Institute</a>
31 * @author <br>John Lilley, <a href=http://www.Empathy.com>Empathy Software</a>
32 */
33 import antlr.collections.AST;
34
35 * representing the current AST root and current AST sibling.
37 * This exists to compensate for the lack of pointers or 'var'
38 * arguments in Java.
39 */
40 public class ASTPair {
41 public AST root; public AST child;
44
45
46 public final void advanceChildToEnd() {
47 if (child != null) {
48 while (child.getNextSibling() != null) {
49 child = child.getNextSibling();
50 }
51 }
52 }
53
54 public ASTPair copy() {
55 ASTPair tmp = new ASTPair();
56 tmp.root = root;
57 tmp.child = child;
58 return tmp;
59 }
60 public String toString() {
61 String r = root==null ? "null" : root.getText();
62 String c = child==null ? "null" : child.getText();
63 return "["+r+","+c+"]";
64 }
65 }
66